Dead to the World (Southern Vampire Mysteries #4)

The vampire Eric loses his memory and Sookie agrees to protect him because whoever took his memory now wants his life. Sookie's investigation into who and why leads straight into a dangerous battle among witches, vampires, and werewolves.

Long Synopsis:

It's not every day that you come across a naked man on the side of the road. That's why cocktail waitress Sookie Stackhouse doesn't just drive on by. Turns out the poor thing hasn't a clue who he is, but Sookie does. It's Eric the vampire--but now he's a kinder, gentler Eric. And a scared Eric, because whoever took his memory now wants his life. Sookie's investigation into who and why leads straight into a dangerous battle among witches, vampires, and werewolves. But a greater danger could be to Sookie's heart--because this version of Eric is very difficult to resist...